1. At the login screen, click 'Options'
2. Goto Account and change your region to 'Europe'
4. Log in
5. Back out
6. Change your region back to 'The Americas'
[note: I tested it to work for me, though some have reported that it doesn't for them. Give it a try - cheers!]
The following was posted deep in another thread, and may help to fix it:
Takes a connection reset to fix. On windows you can open command prompt and reset your connection using
Sometimes that might not be enough, so you might want to do